$0.50–$3 / sq ft
Insulation
Fiberglass batts, mineral wool, foam board, spray foam
R-value per inch and installed cost drive most decisions. Rigid foam and mineral wool are gaining share in mixed-climate builds.
Where insulation wins
- Immediate energy savings
- Wide product range
Where it falls short
- Spray foam requires pros
- Fiberglass loses R when compressed
Best for: Wall cavitiesBest for: Attic floorsBest for: Rim joists
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Hand-picked items DIY builders actually use.
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Insulation kits & suppliers
Companies that sell whole kits or bulk supply.
Compare with other materials
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